Motorcycle Rear Fender and License Plate Bracket Arrangement
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Solution Overview
Problem
Motorcycles with unit swing type engine units face challenges in achieving effective mudguard performance while maintaining a compact rear structure, as large license plate brackets are required for the mudguard function, leading to increased vehicle size and difficulty in compactly forming the rear part.
Innovation Solution
The design includes a license plate bracket positioned lower than the tail light unit and a rear fender extending from the engine body with a lower rear end than the license plate bracket, combined with slanted side covers and a storage box positioned higher than the side covers, allowing for a compact appearance and size while maintaining effective mudguard functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the license plate bracket is formed in a large size to enhance mudguard function, then the mudguard performance is improved, but the rear part of the motorcycle increases in size
Solution Approach 1:
The patent divides the mudguard function between two separate components: the license plate bracket (which provides partial mudguard protection) and the rear fender (which provides additional mudguard protection). This segmentation allows each component to be smaller than a single large mudguard structure while collectively achieving the same protective function, thus resolving the contradiction between mudguard performance and compact size
Solution Approach 2:
The license plate bracket serves dual functions: supporting the license plate and providing mudguard protection. The rear fender similarly serves multiple functions including mudguard protection and aesthetic coverage. This multi-functionality reduces the need for dedicated separate components, enabling a more compact overall design while maintaining effective mudguard performance
2Stability of the object's composition
If the license plate bracket is disposed in a sufficiently rearward position to avoid contact with the rear fender, then the structural interference is eliminated, but the license plate bracket must be further vertically elongated to ensure mudguard function
Solution Approach 1:
Instead of solving the spatial conflict between the license plate bracket and rear fender only in the horizontal dimension (by positioning the bracket rearward), the patent utilizes the vertical dimension by configuring the rear fender to extend downward. This dimensional approach allows the bracket to be positioned more forward while maintaining adequate clearance, reducing the need for vertical elongation
Solution Approach 2:
The rear fender is configured to pivot with the rear wheel, creating dynamic clearance that adapts to the wheel's rotation and suspension movement. This dynamic configuration eliminates the need for excessive static clearance space, allowing more compact positioning of the license plate bracket while preventing contact during operation
Data Source
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AI summary
A motorcycle of the present invention is provided with a unit swing type engine unit. Bottom edges of left and right side covers (32a, 32b) slant in a rearwardly upward direction. A storage box (35) is vertically disposed between a seat (3) and an engine unit (2), while being transversely disposed between the side covers (32a, 32b). Additionally, a bottom face of the storage box (35) is positioned higher than the side covers (32a, 32b) in a side view. A license plate bracket (44) is supported by a frame for being disposed lower than a tail light unit (40). A rear fender (48) rearwardly extends from a vicinity of an engine body (16). A rear end of the rear fender (48) is positioned lower than a bottom end of the license plate bracket (44). The rear fender (48) covers at least above of a rear wheel (6).